CN113442693A - Light transmission control method and light transmission control system for light transmission device - Google Patents
Light transmission control method and light transmission control system for light transmission device Download PDFInfo
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- CN113442693A CN113442693A CN202110389320.0A CN202110389320A CN113442693A CN 113442693 A CN113442693 A CN 113442693A CN 202110389320 A CN202110389320 A CN 202110389320A CN 113442693 A CN113442693 A CN 113442693A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
- B60J3/00—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles
- B60J3/04—Antiglare equipment associated with windows or windscreens; Sun visors for vehicles adjustable in transparency
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/15—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect
- G02F1/1514—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material
- G02F1/1523—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on an electrochromic effect characterised by the electrochromic material, e.g. by the electrodeposited material comprising inorganic material
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Abstract
The disclosure provides a light transmission control method and a light transmission control system for a light transmission device. Wherein the light transmission device comprises a plurality of sub-areas comprising electrochromic material, the light transmission control method for the light transmission device comprises the following steps: determining a target area of the light transmission device between the light ray and the eye area based on an eye area of a user in a vicinity of the light transmission device as a first target area, wherein the first target area includes at least one of a plurality of sub-areas comprising electrochromic material; and applying a current having a current intensity to the first target area to change the light transmittance of the first target area. The light transmission control method for the light transmission device can realize automatic and partial shielding of light rays incident on the eyes of a driver, does not need manual operation of the driver, and avoids causing a vision blind area, thereby lightening the burden of the driver and improving the driving safety.
Description
Technical Field
The present disclosure relates to light transmission control for light transmission devices, and more particularly to light transmission control for light transmission devices containing electrochromic materials.
Background
When a driver drives a vehicle, the driver often feels uncomfortable due to the fact that sunshine outside the vehicle irradiates eyes, visual fatigue or blurred vision are caused, and then potential safety hazards of driving are caused. The existing vehicle adopts a countermeasure that a completely shading sun shield is arranged in front of a driver and the sun shield is used for shielding light rays projected to the eyes of the driver.
However, when using such a conventional sun visor, the driver needs to manually adjust the position of the sun visor so as to block the light incident on the eyes of the driver, and when the light blocking is not required, the driver needs to manually move the sun visor away from the front of the line of sight. This manual operation increases the operation burden on the driver during driving, and may distract the driver, thereby causing a serious driving safety hazard. In addition, the traditional sun visor completely shields the sight in front of the driver, thereby causing a blind field of vision and further influencing the driving safety.
Therefore, there is a need for improvement of the current conventional sun visor so as to reduce the operation burden on the driver and improve the driving safety.
Disclosure of Invention
The technical scheme provided by the invention aims to solve the problems that the traditional sun visor increases the operation burden of a driver, has hidden driving safety hazards and the like in the prior art.
In one aspect of the present invention, there is provided a light transmission control method for a light transmission device comprising a plurality of sub-areas comprising electrochromic material, the method comprising the steps of: determining a target area of the light transmission device between the light ray and the eye area based on an eye area of a user in a vicinity of the light transmission device as a first target area, the first target area including at least one of the plurality of sub-areas comprising electrochromic material; and applying a current having a current intensity to the first target area to change the light transmittance of the first target area.
In at least one embodiment of one aspect of the invention, the method further comprises the steps of: determining a face region of the user and a brightness distribution thereof based on the avatar acquired after the light transmittance of the first target region is changed, the face region including a dark region and a dark region peripheral region, the brightness distribution of the face region including a brightness distribution of the dark region and a brightness distribution of the dark region peripheral region, wherein the brightness of the dark region is lower than the brightness of the dark region peripheral region; determining whether to adjust the first target region to a different second target region based on the eye region of the user and a dark region of the face region of the user; and in response to a positive result of the determination, applying a current having the current intensity to the second target area to change the light transmittance of the second target area.
In at least one embodiment of one aspect of the present invention, determining whether to adjust the first target region to a different second target region based on the eye region of the user and the dark region of the face region of the user comprises: comparing the user's eye region to the dark regions; determining not to adjust the first target region in response to the user's eye region being contained within the dark region; and in response to at least a portion of the user's eye region not being contained within the dark region, determining to adjust the first target region to a second target region.
In at least one embodiment of one aspect of the present invention, determining whether to adjust the first target region to a different second target region based on the eye region of the user and the dark region of the face region of the user comprises: comparing the user's eye region to the dark regions; determine not to adjust the first target area in response to the user's eye area coinciding with the dark area; and in response to the user's eye region not coinciding with the dark region, determining to adjust the first target region to a second target region.
In at least one embodiment of one aspect of the invention, the method further comprises the steps of: comparing the brightness of the dark area with a target brightness; increasing the current intensity of the current applied to the first target area in response to the brightness of the dark area being greater than the target brightness by a first brightness difference threshold so as to decrease the brightness of the dark area; and decreasing the current intensity of the current applied to the first target region in response to the luminance of the dark region being less than the target luminance by a second luminance difference threshold so as to increase the luminance of the dark region.
In at least one embodiment of one aspect of the invention, the method further comprises the steps of: comparing the brightness of the dark area with the brightness of the area around the dark area; increasing the intensity of the current applied to the first target area in response to a difference between the brightness of the dark area peripheral area and the brightness of the dark area being less than a third brightness difference threshold, so as to decrease the brightness of the dark area; and decreasing the intensity of the current applied to the first target area in response to a difference between the luminance of the dark area peripheral area and the luminance of the dark area being greater than a fourth luminance difference threshold, so as to increase the luminance of the dark area.
In at least one embodiment of one aspect of the invention, the method further comprises the steps of: acquiring a head portrait of the user near the light transmission device; and determining the eye region of the user based on the acquired avatar.
In at least one embodiment of one aspect of the present invention, the step of determining the eye area of the user based on the acquired avatar comprises: identifying the eye characteristics of the user according to the acquired head portrait; computing a first eye region based on the eye features; according to the obtained head portrait, other head features of the user except for the eye features are identified; calculating a second eye region based on the other head features; calculating a degree of coincidence of the first eye region with the second eye region; and in response to the calculated degree of coincidence being greater than a degree of coincidence threshold, determining the first eye region or the second eye region as the eye region of the user.
In at least one embodiment of one aspect of the invention, the method further comprises the steps of: determining the optimal light transmittance corresponding to the light intensity data based on the light intensity data and the corresponding relation between the light intensity interval and the optimal light transmittance; and determining the current intensity based on the optimal light transmittance corresponding to the light intensity data.
In at least one embodiment of one aspect of the present invention, the first target area includes a central area and at least one peripheral area, and the step of applying a current having a current intensity to the first target area to change the light transmittance of the first target area includes: applying a current having the current intensity to a sub-region within the central region of the first target region; and applying a current lower than the current intensity to a sub-area within the at least one peripheral area of the first target area.
In another aspect of the present invention, there is provided a light transmission control system for a light transmission device, the light transmission control system including: a light transmissive device comprising a plurality of sub-regions comprising electrochromic material; and a controller coupled with the light transmission device and configured to perform the method as described above.
In at least one embodiment of another aspect of the present invention, the system further comprises: a camera coupled with the controller and configured to capture an avatar of a user, and a memory coupled with the controller and configured to store a target brightness, a first brightness difference threshold, a second brightness difference threshold, a third brightness difference threshold, a fourth brightness difference threshold, and a goodness-of-fit threshold.
In at least one embodiment of another aspect of the present invention, the system further comprises: the light source device comprises a light sensor coupled with the controller and used for sensing light intensity, and a memory used for storing a corresponding table of light intensity intervals and optimal light transmittance.
In at least one embodiment of another aspect of the invention, the light transmission device is an electrochromic glazing that is disposed within a vehicle and that functions as a sun visor or is disposed as a vehicle windshield, the electrochromic glazing comprising a plurality of electrochromic sub-glazings, each of which is individually controlled by the controller.
In yet another aspect of the invention, a computer-readable medium is provided, comprising instructions stored thereon, which, when executed by a processor, cause the processor to perform the method as described above.
Compared with the prior art, the technical scheme provided by the invention has one or more of the following advantages:
(1) the automatic shielding of the light rays incident on the eyes of the driver can be realized, the manual operation of the driver is not needed, and the burden of the driver is reduced;
(2) the light incident on the eyes of a driver can be partially shielded, and a visual field blind area caused by complete shielding of the traditional sun shield is eliminated, so that the driving safety is improved;
(3) the light transmittance control based on the electrochromic glass can realize the adjustment of the light transmittance in a wider range, and the use comfort of users is improved.
Drawings
To further clarify the above and other advantages and features of embodiments of the present invention, a more particular description of embodiments of the present invention will be rendered by reference to the appended drawings. It is appreciated that these drawings depict only typical embodiments of the invention and are therefore not to be considered limiting of its scope as claimed.
Fig. 1 shows a schematic view of a light transmission control system according to an embodiment of the present invention.
Fig. 2 shows a schematic view of a light transmission device comprising a plurality of sub-areas according to an embodiment of the present invention.
Fig. 3 shows a schematic structural view of a sub-region of a light transmission device according to an embodiment of the present invention.
Fig. 4 shows a schematic view of respective regions of a light transmission device according to an embodiment of the present invention being connected to a printed circuit board.
Fig. 5 shows a flow chart of a light transmission control method according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments, examples of which are illustrated in the accompanying drawings. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of various described embodiments. It will be apparent, however, to one skilled in the art that the various embodiments described may be practiced without these specific details. In other instances, well-known methods, procedures, components, circuits, and networks have not been described in detail as not to unnecessarily obscure aspects of the embodiments.
The terminology used in the description of the various described embodiments herein is for the purpose of describing particular embodiments only and is not intended to be limiting. As used in the description of the various described embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
As used herein, the term "if" is optionally to be construed to mean "when … or" after … "or" in response to a determination "or" in response to a detection ", depending on the context. Similarly, the phrase "if determined" or "if detecting" [ stated condition or event ] "is optionally to be construed as meaning" after determination … "or" in response to a determination "or" after [ stated condition or event ] is detected "or" in response to [ stated condition or event ] being detected ", depending on the context.
Referring to fig. 1, fig. 1 shows a schematic diagram of a light transmission control system 10 according to one embodiment of the present invention.
As shown in fig. 1, a light transmission control system 10 (hereinafter referred to as system 10) may include a light transmission device 11. In some embodiments, the system 10 may be part of a vehicle central control system, and the light transmission device 11 may be an electrochromic glazing, which may be used as a sun visor in a vehicle, or may be provided as a windshield, such as a front windshield, for a vehicle. Referring to fig. 1, the light transmission device 11 may include a plurality of sub-regions 110 comprising electrochromic material. The light transmission means 11 comprising a plurality of sub-areas 110 comprising electrochromic material will be described in detail below in connection with fig. 2.
Fig. 2 shows a schematic view of a light transmission device 11 comprising a plurality of sub-areas 110 according to an embodiment of the present invention. As shown in fig. 2, the light transmission device 11 is divided into a plurality of sub-regions 110. In some embodiments, the spacing between the sub-regions 110 may be between 1-2 mm. However, it should be understood that the spacing between the sub-regions 110 is not limited to the spacing sizes described herein and may be adjusted according to the application. Further, the size of each sub-area 110 may be the same or different and may be designed according to the actual application. In the embodiment shown in fig. 2, the light transmission means 11 and the sub-areas 110 are shown as rectangular in shape. However, in other embodiments, the shape of the light transmission means 11 and/or the sub-regions 110 may be designed in other shapes, such as equilateral or non-equilateral polygons, circles, rings, etc. In the embodiment shown in fig. 2, the sub-regions 110 are in a tiled arrangement. However, in other embodiments, the sub-regions 110 may be in a nested arrangement, such as a ring target arrangement. As described above, each sub-region 110 may comprise an electrochromic material. The structure of the sub-region 110 will be described in detail below in conjunction with fig. 3.
Fig. 3 shows a schematic structural view of a sub-region 110 of the light transmission device 11 according to an embodiment of the present invention. As shown in fig. 3, the sub-region 110 may include a plurality of layers, in order, a Glass substrate layer 111, a transparent conductive layer 112, an Electrochromic layer 113, an electrolyte layer 114, an ion storage layer 115, a transparent conductive layer 116, and a Glass substrate layer 117, wherein the Electrochromic layer 113 is made of an Electrochromic material, for example, Electrochromic Glass. Since the electrochromic material undergoes a stable, reversible color change (including a change in transparency) under the action of an applied electric field, the light transmittance of the sub-region 110 can be changed by applying a current across the transparent conductive layers 112 and 116. In other embodiments, the glass substrate layer 111 and the glass substrate layer 117 may be formed of other materials, such as plastic, which may be transparent so that the sub-region 110 appears transparent in the absence of an electrical current applied to the sub-region 110.
Referring back to fig. 1, the system 10 may further include a printed circuit board 12, wherein the printed circuit board 12 is connected with the light transmission device 11. One way of connecting the printed circuit board 12 to the light transmission device 11 will be described below with reference to fig. 4. Fig. 4 shows a schematic view of the connection of the individual sub-areas 110 of the light transmission device 11 to the printed circuit board 12, respectively, according to one embodiment of the invention. As shown in fig. 4, the respective sub-areas 110 of the light transmission devices 11 are connected to the printed circuit board 12 through the wires 17, respectively, whereby the respective sub-areas 110 of the light transmission devices 11 can be independently controlled, so that the light transmittance of the respective sub-areas 110 can be individually changed by individually applying a current to the respective sub-areas 110 of the light transmission devices 11. In some embodiments, the conductive lines 17 may be formed of a transparent and conductive Indium Tin Oxide (ITO) thin film.
Referring back to fig. 1, the system 10 may further include a camera 13, and the camera 13 may be used to capture an avatar of the user for identifying head features of the user, a face region of the user, and a brightness distribution of the face region of the user. The user's head features may be eye features, other head features besides eye features, such as nose features, mouth features, ear features, and the like. The face region may include a dark region and a dark region peripheral region, and the luminance distribution of the face region includes a luminance distribution of the dark region and a luminance distribution of the dark region peripheral region, wherein the luminance of the dark region is lower than the luminance of the dark region peripheral region, and the luminance distribution may be expressed as a combination of both the luminance and the coordinate position. In some embodiments, the system 10 may be part of a vehicle central control system, and the camera 13 may be an onboard camera and may be positioned in front of the driver or passenger (e.g., on/near a mirror in front of and above the primary or secondary driver's seat, on the floor of a center console, etc.) for capturing an overhead image of the driver or passenger in the vehicle. In some embodiments, the camera 13 may be a camera in a Driver Monitoring System (DMS), or may be a camera additionally provided in the vehicle. The light transmission device 11 may be disposed near the driver or passenger, for example, between the driver or passenger and the front windshield.
Referring to fig. 1, the system 10 may further include a light sensor 14, and the light sensor 14 may be used to acquire light intensity data of the surrounding environment. In some embodiments, the system 10 may be part of a vehicle central control system, and the light sensor 14 may be a light sensor disposed on the vehicle, such as at the front windshield of the vehicle, on an exterior rear view mirror, or the like.
Referring to fig. 1, the system 10 may also include a controller 15 and a memory 16. Controller 15 may include one or more controllers or other control circuitry such as analog and/or digital control circuitry including an Application Specific Integrated Circuit (ASIC) for processing data as will be apparent to those skilled in the art. Although the system 10 described herein is described with reference to having a single controller 15, it should be appreciated that the functionality of the controller 15 may be shared or distributed among multiple controllers each configured to perform a particular task. The memory 16 may be a non-volatile memory, such as a non-transitory computer readable storage medium, an electrically erasable programmable read-only memory (EEPROM) for storing one or more routines, thresholds, and captured data. Memory 16 may be part of controller 15 or separate from controller 15, and memory 16 may even be separate from system 10, such as remote memory stored in the cloud (i.e., cloud storage). The memory 16 can be used for storing a corresponding table of the light intensity interval and the optimal light transmittance of the light transmission device 11, target brightness, various thresholds, and the like. The target brightness may be a preset brightness value suitable for the eye region of the user, and the user may not feel dazzling or discomfort when the light having the preset brightness value is irradiated to the eye region of the user. The various types of thresholds may include a coincidence threshold for determining an eye region of the user, a plurality of brightness difference thresholds for determining whether to adjust the current intensity. In the correspondence table of the light intensity interval and the optimal transmittance of the light transmission device 11, the optimal transmittance of the light transmission device 11 corresponding to the light intensity interval may be determined as follows: in a case where the light intensity of the surrounding environment is in the first light intensity interval, if the user feels the most comfortable for the light irradiated to his eyes through the light transmission device 11 having the first light transmittance, the first light transmittance is determined as the optimal light transmittance corresponding to the first light intensity interval. In some embodiments, the optimal transmittance corresponding to the light intensity intervals may be obtained experimentally in the manner described above, and the correspondence table stored in the memory 16 may include a plurality of light intensity intervals and a corresponding plurality of optimal transmittances thereon. In other embodiments, the optimal transmittance corresponding to the light intensity interval may be set empirically, for example, the optimal transmittance corresponding to the solar light intensity interval of the midday summer may be set to the lowest transmittance, for example, 10% transmittance, and the optimal transmittance corresponding to the solar light intensity interval of the evening summer may be set to, for example, 40% transmittance; the optimal light transmittance corresponding to the solar light intensity interval at midday winter is set to a light transmittance of, for example, 30%, and the optimal light transmittance corresponding to the solar light intensity interval at evening winter is set to a maximum light transmittance of, for example, 98%, and so on. In this embodiment, the corresponding table stored in the memory 16 may include a plurality of time intervals, a plurality of light intensity intervals corresponding to the plurality of time intervals, and a plurality of optimal transmittances corresponding to the plurality of light intensity intervals, wherein the light intensity intervals corresponding to the time intervals may be determined experimentally or empirically.
As shown in fig. 1, the controller 15 may be coupled with the printed circuit board 12, the camera 13, the light sensor 14, and the memory 16 for receiving the user's head portrait from the camera 13, receiving the light intensity data of the surrounding environment (e.g., outside the vehicle) from the light sensor 14, accessing a correspondence table of the light intensity intervals stored in the memory 16 and the optimal light transmittance of the light transmission device 11, and controlling the light transmittance of each sub-area 110 in the light transmission device 11 through the printed circuit board 12, respectively. In some embodiments, the controller 16 may be configured to: identifying the head features of the user as described above according to the received head portrait of the user; calculating and determining an eye area of the user according to the recognized head characteristics of the user; determining a target area between the light and the eye area in the light transmission device 11 according to the determined eye area; a current having a current intensity is applied to the determined target area via the printed circuit board 12 to change the light transmittance of the currently determined target area. The controller 16 may be further configured for: determining the face area of the user and/or the brightness distribution of the face area according to the head portrait of the user; the target area in the light transmission device 11 is adjusted and/or the current intensity of the current applied to the target area is adjusted according to the face area of the user and/or the brightness distribution thereof. The controller 16 may be further configured to: determining the optimal light transmittance of the light transmission device 11 corresponding to the received light intensity data according to the light intensity data received from the light sensor 14 and the correspondence table of the light intensity interval and the optimal light transmittance of the light transmission device 11; and determines the amperage of the current to be applied to the target area in the light transmission device 11 based on the optimal light transmission of the light transmission device 11. The controller 16 may also be coupled with a system clock and may be further configured to: accessing a system clock to determine a time interval in which the current time is located (e.g., a summer midday time, a summer evening time, a winter midday time, a winter evening time, etc.); determining the optimal light transmittance of the corresponding light transmission device 11 according to the correspondence table including the time interval, the light intensity interval and the optimal light transmittance stored in the memory 16; and according to the optimal light transmittance of the light transmission device 11; the amperage of the current to be applied to the target area in the light transmission means 11 is determined.
For purposes of clarity, the printed circuit board 12, controller 15 and memory 16 are shown herein as separate distinct components. In some cases, however, the printed circuit board 12, the controller 15, and the memory 16 may be integrated into a single component, for example, the controller 15 and the memory 16 may be incorporated into the printed circuit board 12. In other embodiments, the system 10 may not include the printed circuit board 12, and the controller 15 may be directly electrically connected to each of the sub-areas 110 of the light transmission device 11 to directly control the light transmission of each of the sub-areas 110.
Fig. 5 shows a flow diagram of a light transmission control method 500 according to an embodiment of the invention. The method 500 may be implemented using the light transmission control system 10 illustrated in fig. 1.
Step 502 captures an avatar of the user near the light transmission device 11 with the camera 13 and sends the avatar of the user to the controller 15. In some embodiments, the camera 13 may capture a user avatar in response to the light transmission control system 10 being enabled and send the captured user avatar to the controller 15. The process proceeds to step 504.
At step 504, the user's eye area is determined by the controller 15. In some embodiments, controller 15 may utilize image recognition techniques to identify the eye features of the user and other head features other than eye features based on the user's avatar received from camera 13. In other embodiments, the controller 15 may receive the user's avatar from a driver monitoring system in communication with the controller 15 and utilize image recognition techniques to identify the user's eye features and other head features other than eye features based on the user's avatar received from the driver monitoring system. The controller 15 may be further configured to calculate a first eye region based on the identified eye characteristics; calculating a second eye region based on the identified other head features except for the eye features; calculating a contact ratio of the first eye region and the second eye region; and determining the first eye region or the second eye region as the eye region of the user when the calculated degree of coincidence is greater than or equal to a degree of coincidence threshold. In some embodiments, controller 15 may re-identify the head feature from the currently received user avatar when the calculated degree of coincidence is less than the degree of coincidence threshold, re-calculate the first and second eye regions, and calculate the degree of coincidence of the re-calculated first and second eye regions until the calculated degree of coincidence is greater than or equal to the degree of coincidence threshold. In other embodiments, the controller 15 may receive the user avatar again from the camera 13 or the driver monitoring system when the calculated degree of coincidence from the currently received user avatar is less than the degree of coincidence threshold a predetermined number of times (e.g., one, five, or other number of times), re-identify the head features from the re-received user avatar, re-calculate the first and second eye regions, and calculate the degree of coincidence of the re-calculated first and second eye regions until the calculated degree of coincidence is greater than or equal to the degree of coincidence threshold. In some embodiments, the threshold overlap ratio may be set at 90% or other percentage. In other embodiments, the controller 15 may identify certain head features of the user (e.g., eye features or some other head features other than eye features) from the received avatar of the user. The controller 15 may determine the eye region of the user directly based on the recognized eye features, or calculate the eye region of the user based on some other head features besides the eye features, such as nose features, mouth features, and/or ear features. The process proceeds to step 506.
In step 506, a target area in the light transmission device 11 between the light and the eye area is determined by the controller 15. In some embodiments, the controller 15 may determine a target area in the light transmission device 11 between the light and the eye area as a first target area based on the eye area determined in step 504, which may include one or more of the plurality of sub-areas 110. The process proceeds to step 508.
At step 508, current is applied to the determined target area by the controller 15. In some embodiments, the controller 15 may apply a current having a current intensity to a first target area comprising the one or more of the sub-areas 110 to change the light transmittance of the one or more of the sub-areas 110. In another embodiment, when the first target region includes a central region and at least one peripheral region, the controller 15 may apply a current having a current intensity to a sub-region within the central region of the first target region; applying a current of a lower intensity than said current applied to the central area to a sub-area within at least one peripheral area of the first target area. In some embodiments, the amperage of the current applied to the first target area or the amperage of the current applied to the center area of the first target area can be a default amperage, such as can be an amperage that changes the light transmittance of the sub-area 110 to 60% or other light transmittance. In other embodiments, the controller 15 may determine an optimal light transmittance corresponding to the current light intensity interval of the surrounding environment, and determine a current intensity corresponding to the optimal light transmittance of the current to be applied to the first target region or to the central region of the first target region. For example, the controller 15 may determine the light intensity interval in which the light intensity is located according to the light intensity data of the surrounding environment received from the light sensor 14, or determine the sunlight intensity interval of the time interval in which the current time is located according to the system clock (e.g., whether summer noon, summer early evening time, winter noon, winter early evening time, etc.); determining the optimal light transmittance of the light transmission device 11 corresponding to the light intensity interval in which the received light intensity data is located or the sunlight light intensity interval of the time interval in which the current time is located, according to the determined light intensity interval by accessing the correspondence table of the light intensity interval stored in the memory 16 and the optimal light transmittance of the light transmission device 11; and determines the current intensity that changes the transmittance of the sub-region 110 to the optimal transmittance. The process proceeds to step 510.
The user's avatar near the light transmission device 11 is captured again with the camera 13 and transmitted to the controller 15, step 510. In some embodiments, the controller 15 may send a command to the camera 13 to capture the user avatar again after applying the current to the first target area, and the camera 13 may capture the user avatar in response to the command of the controller 15 and send the captured user avatar to the controller 15. In other embodiments, the camera 13 may periodically capture a user avatar after the light transmission control system 10 is enabled and send the captured user avatar to the controller 15. The process proceeds to step 512.
In step 512, the face area of the user and the brightness distribution thereof are determined by the controller 15. In some embodiments, the controller 15 may determine the face region of the user and its intensity distribution using image recognition techniques based on the user avatar received in step 510. The face region may include a dark region and a dark region peripheral region. The brightness distribution of the face region may include a brightness distribution of a dark region and a brightness distribution of a peripheral region of the dark region, wherein the brightness of the dark region is lower than the brightness of the peripheral region of the dark region and the brightness distribution may be expressed as a combination of both the brightness and the coordinate position. In some embodiments, the brightness of the dark region and the dark region peripheral region may be the brightness of the smallest unit (e.g., pixel) in the respective regions. In other embodiments, the brightness of the dark region and the peripheral region of the dark region may be an average brightness of the respective regions. In still other embodiments, controller 15 may further determine the eye area of the user again using image recognition techniques based on the user avatar received in step 510, as described in step 504. The process proceeds to step 514.
In step 514, the controller 15 determines whether to adjust the target area. In some embodiments, the controller 15 may determine whether to adjust the target region based on the eye region determined in step 504 or step 512 and the dark region of the face region determined in step 512, for example, the target region to be adjusted may be a first target region determined as the target region in step 506 or may be a second target region adjusted as the target region in step 516 described below. In one embodiment, controller 15 may compare the determined eye region to a dark region, determine not to adjust the target region when the determined eye region is contained within the dark region and the process proceeds to step 518; and when at least a portion of the determined eye region is not contained within the dark region, an adjustment target region is determined and the process proceeds to step 516. In another embodiment, controller 15 may compare the determined eye region to a dark region distribution, when the determined eye region coincides with a dark region, determine not to adjust the target region and the process proceeds to step 518; and when the determined eye region does not coincide with a dark region, an adjustment target region is determined and the process proceeds to step 516.
The target area is adjusted by the controller 15, step 516. In some embodiments, the controller 15 may adjust the target area, for example, adjust a first target area determined to be the target area in step 506 to a second target area different from the first target area, wherein the second target area includes another one or more of the plurality of sub-areas 110, or further adjust the second target area adjusted to be the target area in step 516 described below to other target areas different from the second target area. The adjustment may expand the range of the dark area or may adjust the position coordinates of the dark area to a direction that can cover more eye areas. The process proceeds to step 518.
At step 518, it is determined by the controller 15 whether to adjust the applied current. In some embodiments, the controller 15 may determine whether to adjust the current intensity of the current currently applied based on the brightness of the dark area of the face area determined in step 512, the target brightness obtained from the memory 16, and the first and second brightness difference thresholds. When the brightness of the dark area is greater than the target brightness by the first brightness difference threshold, the current intensity of the current currently applied is increased so that the brightness of the dark area can be reduced. When the brightness of the dark area is smaller than the target brightness by the second brightness difference threshold, the current intensity of the current currently applied is decreased so that the brightness of the dark area can be increased. The first and second brightness difference thresholds may be 0 values or other desired difference values. In other embodiments, the controller 15 may determine whether to adjust the current intensity of the current applied based on the brightness of the dark area of the face area and the brightness of the dark area peripheral area determined in step 512 and the third and fourth brightness difference thresholds obtained from the memory 16. For example, when the difference between the luminance of the dark area and the luminance of the dark area is less than the third luminance difference threshold, the current intensity of the current currently applied may be increased so as to decrease the luminance of the dark area. When the difference between the luminance of the dark area and the luminance of the dark area is greater than the fourth luminance difference threshold value, the current intensity of the current currently applied may be decreased so as to increase the luminance of the dark area. When the difference between the luminance of the dark area peripheral area and the luminance of the dark area is between the third and fourth luminance difference thresholds, the current intensity of the applied current may be maintained. The third and fourth luminance difference thresholds may be the same or different. When the determination result of step 518 is no, the process proceeds to step 522, and when the determination result of step 518 is yes, the process proceeds to step 520.
The current intensity of the current is adjusted by the controller 15, step 520. In some embodiments, the controller 15 may adjust the amperage of the current used in step 508 to the adjusted amperage, e.g., greater or less than the amperage of the current used in step 508, based on the determination made in step 518. The process proceeds to step 522.
At step 522, current is applied to the target area by the controller 15. Depending on the results of the determinations in steps 514 and 518, the controller 15 decides to apply a current having an unadjusted or adjusted current intensity to the first target area, the second target area, or other target areas. For example, when step 514 determines that the target area does not need to be adjusted and step 518 determines that the current level does not need to be adjusted, the controller 15 may keep applying the current having the current level that is not adjusted to the first target area that is not adjusted. When step 514 determines that the target area does not need to be adjusted and step 518 determines that the current level needs to be adjusted, the controller 15 may apply a current having the adjusted current level to the first target area that is not adjusted. When step 514 determines that the target region needs to be adjusted and step 518 determines that the current level does not need to be adjusted, the controller 15 may apply a current having an unadjusted current level to the second target region after adjustment. When step 514 determines that the target region needs to be adjusted and step 518 determines that the current intensity needs to be adjusted, the controller 15 may apply a current having the adjusted current intensity to the adjusted second target region.
In some embodiments, after step 522 is performed, the process may return to step 510 and repeat steps 510 and 522 to accommodate the user's head movement or ambient lighting changes.
The above steps are exemplary and not intended to be limiting. One skilled in the art may add one or more steps, or delete one or more of the above steps, or combine or replace one or more of the above steps, or adjust the order of one or more of the above steps according to his needs. For example, in other embodiments, the order of steps 514 and 518 may be interchanged, i.e., it is determined whether to adjust the current applied to the target area and then whether to adjust the target area, and accordingly, the order of steps 516 and 520 may be interchanged. In other embodiments, steps 514 and 516, or steps 518 and 520, or steps 514 and 520 may be deleted. In even further embodiments, the process may include only steps 506 and 508, and accordingly, the system 10 may include only the light transmission device 11 and the controller 15.
Portions of the various embodiments described above may be provided as a computer program product that may include a computer-readable medium having stored thereon computer program instructions that may be used to program a computer (or other electronic devices) to be executed by one or more processors to perform a process according to some embodiments. The computer-readable medium may include, but is not limited to, magnetic disks, optical disks, read-only memories (ROMs), Random Access Memories (RAMs), erasable programmable read-only memories (EPROMs), electrically erasable programmable read-only memories (EEPROMs), magnetic or optical cards, flash memory, or other type of computer-readable media suitable for storing electronic instructions. Moreover, embodiments may also be downloaded as a computer program product, wherein the program may be transferred from a remote computer to a requesting computer. In some embodiments, a non-transitory computer-readable storage medium has stored thereon data representing sequences of instructions that, when executed by a processor, cause the processor to perform certain operations.
While the present invention has been described in accordance with the preferred embodiments of the present disclosure, it is not intended to be limited thereto, but rather only by the scope set forth in the appended claims. It will be appreciated by persons skilled in the art that various modifications and changes may be made to the embodiments described herein without departing from the broader spirit and scope of the invention as set forth in the appended claims.
Claims (15)
1. A light transmission control method for a light transmission device comprising a plurality of sub-areas comprising electrochromic material, the method comprising the steps of:
determining a target area of the light transmission device between the light ray and the eye area based on an eye area of a user in a vicinity of the light transmission device as a first target area, the first target area including at least one of the plurality of sub-areas comprising electrochromic material; and
applying a current having a current intensity to the first target area to change the light transmittance of the first target area.
2. The method of claim 1, wherein the method comprises the further steps of:
determining a face region of the user and a brightness distribution thereof based on the avatar acquired after the light transmittance of the first target region is changed, the face region including a dark region and a dark region peripheral region, the brightness distribution of the face region including a brightness distribution of the dark region and a brightness distribution of the dark region peripheral region, wherein the brightness of the dark region is lower than the brightness of the dark region peripheral region;
determining whether to adjust the first target region to a different second target region based on the eye region of the user and a dark region of the face region of the user; and
in response to a yes determination, applying a current having the current intensity to the second target area to change the light transmittance of the second target area.
3. The method of claim 2, wherein determining whether to adjust the first target region to a different second target region based on the eye region of the user and the dark region of the face region of the user comprises:
comparing the user's eye region to the dark regions;
determining not to adjust the first target region in response to the user's eye region being contained within the dark region; and
determining to adjust the first target region to a second target region in response to at least a portion of the user's eye region not being contained within the dark region.
4. The method of claim 2, wherein determining whether to adjust the first target region to a different second target region based on the eye region of the user and the dark region of the face region of the user comprises:
comparing the user's eye region to the dark regions;
determine not to adjust the first target area in response to the user's eye area coinciding with the dark area; and
determining to adjust the first target region to a second target region in response to the user's eye region not coinciding with the dark region.
5. The method of claim 2, further comprising the steps of:
comparing the brightness of the dark area with a target brightness;
increasing the current intensity of the current applied to the first target area in response to the brightness of the dark area being greater than the target brightness by a first brightness difference threshold so as to decrease the brightness of the dark area; and
in response to the brightness of the dark region being less than the target brightness by a second brightness difference threshold, decreasing the amperage of the current applied to the first target region to increase the brightness of the dark region.
6. The method of claim 2, further comprising the steps of:
comparing the brightness of the dark area with the brightness of the area around the dark area;
increasing the intensity of the current applied to the first target area in response to a difference between the brightness of the dark area peripheral area and the brightness of the dark area being less than a third brightness difference threshold, so as to decrease the brightness of the dark area; and
in response to a difference between the luminance of the dark area peripheral area and the luminance of the dark area being greater than a fourth luminance difference threshold, decreasing the current intensity of the current applied to the first target area so as to increase the luminance of the dark area.
7. The method of claim 1, further comprising the steps of:
acquiring a head portrait of the user near the light transmission device; and
determining the eye region of the user based on the acquired avatar.
8. The method of claim 7, wherein determining the eye region of the user based on the acquired avatar comprises:
identifying the eye characteristics of the user according to the acquired head portrait;
computing a first eye region based on the eye features;
according to the obtained head portrait, other head features of the user except for the eye features are identified;
calculating a second eye region based on the other head features;
calculating a degree of coincidence of the first eye region with the second eye region; and
determining the first eye region or the second eye region as the eye region of the user in response to the calculated degree of coincidence being greater than a degree of coincidence threshold.
9. The method of claim 1, further comprising the steps of:
determining the optimal light transmittance corresponding to the light intensity data based on the light intensity data and the corresponding relation between the light intensity interval and the optimal light transmittance; and
determining the current intensity based on the optimal light transmittance corresponding to the light intensity data.
10. The method of claim 1, wherein the first target region comprises a central region and at least one peripheral region, and
the step of applying a current having a current intensity to the first target area to change the light transmittance of the first target area comprises:
applying a current having the current intensity to a sub-region within the central region of the first target region; and
applying a current of a lower current intensity than said current intensity to a sub-area within said at least one peripheral area of said first target area.
11. A light transmission control system for a light transmission device, the light transmission control system comprising:
a light transmissive device comprising a plurality of sub-regions comprising electrochromic material; and
a controller coupled with the light transmission device and configured to perform the method of claims 1-10.
12. The system of claim 11, wherein the system further comprises:
a camera coupled to the controller and configured to capture an avatar of a user, an
A memory coupled with the controller and configured to store a target brightness, a first brightness difference threshold, a second brightness difference threshold, a third brightness difference threshold, a fourth brightness difference threshold, and a goodness-of-overlap threshold.
13. The light transmission control system of claim 11, further comprising:
a light sensor coupled to the controller for sensing light intensity, an
And the memory is used for storing a corresponding table of the light intensity interval and the optimal light transmittance.
14. A light transmission control system as claimed in any one of claims 10 to 13, wherein the light transmission device is an electrochromic glazing provided in a vehicle and acting as a sun visor or as a vehicle windscreen, the electrochromic glazing comprising a plurality of electrochromic sub-glazings, each being individually controlled by the controller.
15. A computer readable medium comprising instructions stored thereon, which when executed by a processor, cause the processor to perform the method of any of claims 1-10.
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